Defect detector circuit with a signal synthesizer and magnet disk certifier using the same defect detector circuit
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United States of America Patent
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Apr 22, 2003
Grant Date -
Apr 11, 2002
app pub date -
Sep 26, 2001
filing date -
Sep 28, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A magnetic disk certifier includes a defect detector circuit comprising a low-pass filter for extracting a low frequency component of the read-out signal, the low frequency component containing a signal component of the error, a signal generator circuit for generating a signal having a predetermined frequency lower than the frequency of the read-out signal, a synthesizer circuit for synthesizing an output signal of the low-pass filter and the signal outputted from the signal generator circuit and a comparator for generating an error signal by comparing the synthesized signal from the synthesizer circuit with a predetermined reference level.
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